Best places in Europe to live with disabilities that require a wheelchair

My wife and I will be traveling in Europe in May and June with our three young adult sons, with the specific eye on finding a possible second home that has most of the amenities needed for life with a wheelchair. Our oldest boy can only walk with assistance and has some rather severe issues, but his general health is good. In our place in the western U.S., he has easy access to medical care, an adult day program for socialization, and care workers that help us with some of his day-to-day living.

Redditers, any suggestions of places in Europe that are compatible with traveling to, and possibly moving and living with a family member in a wheelchair? We've had suggestions of southern France, such as Nice and possibly Lyon, but we are open to suggestions of other countries. Northern Italy, Portugal, Ireland, and even some of the Nordic countries have all been tossed into the ring.

For those Europeans living with disabilities, we would really appreciate your perspectives and insights. Thanks you!